I know a lot of people who still believe official history because they continue to think the people in power, and the people writing the history books, are good people. Most of them are right wing, too, and know the media lies to them all the time.

I think it's because they're good people, who prefer to judge others by their own standards and morality, or from the people around them. In that regard, they're very insulated from the evils of the world, as they're not being punched in the face with it every time they walk out their door. White flight is a hindrance in this regard, as it enables naivety to last longer than it should, because we prefer to live among our own kind, among good people.

I can speak from personal experience that it can take quite a bit of time for a good person to finally wake up to the evil in others, and to be able to spot it and its behaviors. It took me a while to fully realize, as I simply don't think in the terms of what truly evil people do. I was judging others based off my own naive metrics, and it wasn't making sense, which resulted in quite a lot of pain (being fucked over by people who took advantage of me). Once I realized the truth and began to see the obvious evils in the world, it made way, way more sense. I no longer ask "why would someone do that?" or make the statement "no one would ever do that". Also, studying confirmed conspiracy theories helped a lot, too, showing what people are capable of (the enslavement, poisoning, starvation, and murder of hundreds of millions).